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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55bcb36c893cf3089446997b322b8b68466b6dde920752d01b1a3b33bfd6a270' 
  AND token = 'bapmsGZuK1FlbDMMUM4LdfXr9aMv9GIfHZUMmskYc5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}